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I have a large aloe plant that is probably 5 years old and has bloomed twice. Stem is very tall and leaves are approximately 2½ to 3ft (750 to 900mm) long and still very green except at the stem where they appear to be rotting. Also brown circular spots on some of the leaves. Very robust at the top however heavy and leaning over cannot support itself.

Q. How do I save this plant?

  • 3
    Can you please post a photo or two of the damaged plant? – Mike Perry Sep 23 '11 at 17:12
  • Yes a photo will be useful. Are they rotting, or simply dying because they are old leaves? – winwaed Sep 23 '11 at 17:13
  • I am new at this so bear with me here. The plant is probably 5 yrs old and has bloomed twice. Stem is very tall and leaves are approximately 2½-3 ft long and still very green except @ the stem. Also brown circular spots on some of the leaves. Very robust at the top however heavy and leaning over cannot support itself. I will try to post a picture, unfortunately a novice in that area too. – Rennie Sep 23 '11 at 17:20
  • 1
    You might want to describe the soil, and how you water it. – Ed Staub Sep 23 '11 at 19:01
7

Rotting in aloes is caused by fungus. The fungus enters through weak or dead growth, and spreads and grows when any of the following factors are present:

  • Very high humidity
  • Low light
  • Too much water
  • Poor drainage
  • Extended low temperatures
  • Extensive cuts or bruises
  • Sitting water at the base of the leaves
  • Sunburn (usually only in potted plants moved from low to full sun)
  • Too much fertilizer

Prevention is better than cure. Try to provide the best conditions you can (ie, the opposite of the factors listed above). To control, apply a fungicide according to the directions on the label, until the infection is gone. Reapply at any sign of recurrence.

I had some problems with rot in my potted aloes, until I repotted them into a lighter mix.

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